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CVE-2026-53398

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_…

Published Jul 19, 2026EPSS 0.54%

Overview

CVE-2026-53398 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Fix SECINFO_NO_NAME decode error cleanup

nfsd4_decode_secinfo_no_name() currently initializes sin_exp after

decoding sin_style. If the XDR stream is truncated, the decoder returns

nfserr_bad_xdr before sin_exp is initialized.

Since commit 3fdc54646234 ("NFSD: Reduce amount of struct

nfsd4_compoundargs that needs clearing"), the inline iops array is not

cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore

leave sin_exp holding stale union contents from a previous operation.

The error response path still invokes nfsd4_secinfo_no_name_release(),

which calls exp_put() on a non-NULL sin_exp.

Initialize sin_exp before the first failable decode step, matching

nfsd4_decode_secinfo().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/161d1aaeb04d620d3692639700512bb5038c1e10Refgit.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647Refgit.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232Refgit.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439Refgit.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585Refgit.kernel.org/stable/c/8836405abdc53ca3dd5fc68b2cf6f8f012fad011Refgit.kernel.org/stable/c/9e18e83b8846a5c3fe13fc8a464b4865d33996c6Refgit.kernel.org/stable/c/c8a24effd96d4779e2ad779654682304491c55a5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53398?

CVE-2026-53398 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-53398?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53398?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53398?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53398 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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